Apple is currently working on iOS 7 for its mobile army of iDevices, but it looks like the Cupertino company has fallen behind schedule.

John Gruber of Daring Fireball revealed that iOS 7 is in the works, but the production schedule has fallen behind. So much, in fact, that engineers working on OS X 10.9 have been switched over to iOS 7 for its completion.

Furthermore, Gruber noted that iOS engineers who are carrying the new mobile operating system around have some sort of polarizing filter on their iPhone displays, which has made it more difficult for the public to sneak a peek at the brand-new version of iOS.

While there aren't many iOS 7 details available at this point (which will reportedly have a system-wide UI overhaul), Gruber has heard that “Ive’s work is apparently making many people really happy, but will also apparently make rich-texture-loving designers sad.”

Apple's mobile operating system is likely going through a huge overhaul because it's in the midst of creating entirely new gadgets, such as the upcoming smart watch. Reports have said that the new watch's OS will be built from the ground up rather than starting with the iPod nano's touch operating system (which has a screen about the size of a watch). Also, the iPhone/iPad's OS must be reconstructed to work with the new devices.

Before iOS 6, Apple used Google Maps as its main maps app. But in early 2012, Apple gave Google the boot and decided that iOS 6 would have a brand-new service made by Apple.

Things didn't go too well in the beginning. The app flunked at both navigation and geography. Many world landmarks, and even continents/countries/cities appeared as distorted blobs or didn't appear at all. It turned into a huge fiasco, which Apple CEO Tim Cook was stuck apologizing for. The iOS 6 maps app manager was also fired.